Home / 645,086.12-890,241.70-354,719.80

Finding the Fourth Proportional to 645,086.12, 890,241.70 and 354,719.80

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Solution

The fourth proportional to 645,086.12, 890,241.70 and 354,719.80 is: 489,525.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    645,086.12 : 890,241.70 = 354,719.80 : x
  2. Step 2: Convert to fraction form
    645,086.12/890,241.70 = 354,719.80/x
  3. Step 3: Cross multiply
    645,086.12x = 890,241.70 × 354,719.80
  4. Step 4: Simplify right side
    645,086.12x = 315,786,357,775.66
  5. Step 5: Solve for x
    x = 315,786,357,775.66/645,086.12
  6. Step 6: Final answer
    x = 489,525.89

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.